JP2609664B2 - Wireless telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention has a parent device connected to a wired telephone line, and a wireless telephone connected to the parent device via a wireless line. The present invention relates to a wireless telephone device, and more particularly, to a wireless telephone device that sends a signal tone indicating this to a wired telephone line to notify the other party when the received electric field level of the wireless line is lowered.

(Prior Art) Conventionally, this type of device has been configured as shown in FIG.

That is, the parent device 1 is connected to the wireless telephone 2 via a wireless line and also to the wired telephone line 3.
The operation will be outlined below.

The signal transmitted from the wired telephone line 3 is used as a modulation input of the transmitter 5 via the hybrid circuit 4. The radio wave modulated by the transmitter 5 is sent from the transmitting antenna 6 to the wireless telephone 2. On the other hand, a radio wave transmitted from the wireless telephone 2 is received by the receiving antenna 7 and demodulated by the receiver 8. The demodulated signal is transmitted to the wired telephone line 3 via the hybrid circuit 4.

The synthesizer 9 outputs a frequency corresponding to the radio channel to the transmitter 5 and the receiver 8.

One of the outputs of the receiver 8 is input to the reception electric field detection circuit 10, and the electric field strength is determined. This circuit is generally called a carrier squelch circuit or a noise squelch circuit. Another output is output as a data signal included in the received demodulated wave, and is input to an identification signal detection circuit 11 for collating an identification signal determined by a combination of the parent device 1 and the wireless telephone 2, and collated. This identification signal is generally called an ID code.

The outputs of the detection circuits 10 and 11 and the demodulated output of the data signal are input to the control circuit 12 and used for connection control. Further, the control circuit 12 controls the synthesizer 9 to perform radio channel control and controls the transmitter 5 to transmit a transmission data signal as a modulation input.

On the other hand, the wireless telephone 2 also has a receiving antenna 13 and a receiver 14, and the demodulated output is output to the receiver 15. Also,
The voice input from the transmitter 16 becomes the modulation input of the transmitter 17, and is transmitted as a radio wave from the transmission antenna 18.

The synthesizer 19, the received electric field detection circuit 20, and the identification signal detection circuit 21 are equivalent to those of the parent device 1, and the control circuit 22 controls the wireless telephone 2. The speaker 23 is a sounder that emits a ringing tone when an incoming call arrives.

In these power supply systems, the parent device 1 connects the AC plug 24 to AC100V and uses the output of the clear stream stabilizing circuit 25. Also,
This output is via current limiting resistor 26 and charging terminals 27 and 28,
It is supplied to the rechargeable battery 29 of the wireless telephone 2, and the output of the battery 29 is used as the power source of the wireless telephone 2.

When making a call from this wireless telephone device, one of the key units 30 of the wireless telephone 2 (for example, a call key (not shown)) is pressed. The wireless telephone 2 sets the synthesizer 19 to the control channel, and when the control channel is not used, the transmitter 17
Is turned on and the calling signal including the ID code is transmitted. Parent device 1
Receives the call signal and, when judging that the ID code matches, turns on the transmitter 5 and generates a call response signal including the channel code and the ID code of the communication channel which has been confirmed to be unused in advance. Is transmitted on the control channel to switch the synthesizer 9 to the speech channel. Upon receiving the call response signal having the matching ID code, the wireless telephone 2 turns off the transmitter 17 and switches the synthesizer 9 to the communication channel according to the channel code included in the received call response signal. If the call channel is unused, transmitter 17
Is turned on, and a channel switching completion signal is transmitted. Parent device 1
Then, upon receiving the channel switching completion signal, it transmits an AFON signal indicating the start of a call and controls the hybrid circuit 4 to connect to a wired line. When the wireless telephone 2 receives the AFON signal, the transmitter 16 and the receiver 15 are operated to start a call operation.

In the call operation, the parent device 1 is performing the operation of the flowchart shown in FIG. When the reception electric field detection circuit 10 detects a decrease in the electric field (step 101), the output of the receiver 8 is turned off (step 102) so that the radio noise does not appear on the wired line. As a result, the input voice of the transmitter 16 of the wireless telephone 2 is not output to the wired telephone line 3 and the silent state occurs. Further, after 30 seconds have passed while the reception electric field continues to decrease (step 104), a forced call termination signal is transmitted to the wireless telephone 2 (step 105), and the standby state is restored. This disconnects the connection to the wired line. This gives the other party a busy tone from the exchange.

Upon receiving the forced end signal (step 201), the wireless telephone 2 disconnects the wireless line immediately and returns to the standby state.

If the forced termination signal is not received in step 201, the wireless telephone 2 determines whether or not there is a dial operation with the key unit 30 (step 202), and if there is a dial operation, transmits a dial signal (step 202). 203). If it is determined in step 204 that the call is to be ended, a call end signal is transmitted (step 205), and a standby state is set. If it is not determined in step 204 that the call has ended, the process returns to step 201 to determine whether the forced call end signal has been received.

If the received electric field does not decrease or if the received electric field decreases but recovers within 30 seconds, master device 1 determines whether a dial signal is received (step 106). If the dial signal has been received, the dial signal is transmitted to the wired telephone line 3 (step 107). As a result, when the other party answers, a call can be made via a wired telephone line. At step 108, the reception of the end signal is determined, and when the end signal is received, the standby state is set. If the end signal is not received, the process returns to step 101 to determine again whether the reception electric field has dropped. After the output of the receiver is turned off in step 102, the process returns to step 101 and the receiver is turned on again (step 103) unless a decrease in the received electric field is detected.

(Problems to be Solved by the Invention) As described above, in the conventional device, when no sound is output from the wireless telephone 2 to the wired telephone line 3 or when the sound is continued for a long time, the other party cannot understand the state of the wireless telephone. There was a problem that I was worried because there was no such thing, and after that, if both parties suddenly disconnected the call, it could be confused as a malfunction of the telephone.

Therefore, the present invention eliminates this problem, prevents a long period of silence, and further allows at least the user of the wireless telephone to be informed that the reception electric field level is decreasing. The purpose is to provide a telephone device.

[Configuration of the invention]

(Means for Solving the Problems) According to the present invention, there is provided a master device connected to a wired telephone line, and a wireless telephone connected to the master device via a wireless line. A wireless telephone device comprising: a receiving electric field level detecting means for detecting a decrease in a receiving electric field level of the wireless line; and a means for cutting off a voice received from the wireless telephone in response to a detection output of the receiving electric field level detecting means. A timer means for starting operation in response to a detection output of the reception electric field level detection means, and outputting a signal that the detection output of the reception electric field level is still generated even after a lapse of a fixed time; Means for transmitting a signal tone to the wired telephone line in response to the output.

Further, according to the present invention, it further comprises means for transmitting a signal tone to the wireless telephone in response to the output of the timer means.

(Operation) In the present invention, when the decrease of the received electric field level continues for a certain period of time or more, a signal is output from the timer means, and a signal sound is sent to the wired telephone line by this signal. This prevents the other party from being silent for a long time. Further, if the radio telephone is configured to notify the reception telephone drop by a signal tone, for example, even if the line is forcibly disconnected, the reason can be understood. Moved to a place.

(Embodiment) FIG. 1 shows an embodiment of a wireless telephone device of the present invention. In FIG. 1, parts having the same functions as those shown in FIG. 3 are denoted by the same reference numerals as in FIG. 3, and description thereof will be omitted.

The embodiment shown in FIG. 1 is configured by adding an alarm sound circuit 31 and a notification sound circuit 32 to the circuit shown in FIG. Hereinafter, the operation of this embodiment will be described with reference to the flowchart shown in FIG.

The parent device 1 checks the output of the reception electric field detection circuit 10 (step 101) and turns off the output of the receiver 18 when the electric field decreases (step 102). When the electric field decreases for another 3 seconds (step 111), the hybrid circuit 4 Control
The output of the alarm sound circuit 32 is sent to the wired telephone line 3 (step 112), and the transmitter 5 is further controlled to switch the input of the transmitter 5 from the hybrid circuit output to the output of the alarm sound circuit 31 (step 113). . As a result, a notification sound is generated from the handset 15 of the wireless telephone 2, so that the user of the wireless telephone 2 knows that he / she has gone outside the area where communication is possible.

Here, as a result of the movement of the wireless telephone 2, when it is determined that the reception electric field has increased (step 101), the output of the receiver 18 is turned on (step 103), and the hybrid circuit 4 is controlled.
The output of the notification sound circuit 32 is switched to the output of the receiver 18 (step 114), the input of the transmitter 5 is returned to the output of the hybrid circuit 4 (step 115), and the parent device 1 is returned to the original communication state.

On the other hand, when the electric field continues to drop for 30 seconds (step
104) Transmit forced termination signal to wireless telephone 2 (step 1)
05), the apparatus enters the standby state, turns off the transmitter 5, and disconnects from the wired telephone line 3.

On the other hand, upon receiving the forced end signal (step 201), the wireless telephone 2 immediately turns off the transmitter 17 and enters a standby state.

Note that steps 106, 107, 108, 202, 203, 204, 205
Is the same as that shown in FIG.

Further, the notification sound circuit 31 can be replaced with a circuit that emits a hold sound in a wireless telephone device having a hold function.

〔The invention's effect〕

As described above, according to the present invention, even if the received electric field level decreases, the other party does not remain silent for a long time, so that the other party does not feel uneasy. Also, it is possible to inform the wireless telephone side that the parent device has determined that the distance is such that a call cannot be made, so that the user can approach the parent device. There is an advantage that the user is not mistaken for a failure.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a radio telephone apparatus according to the present invention, FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG. 1, and FIG. 3 is a block diagram showing a conventional radio telephone apparatus. 4 and 5 are flowcharts for explaining the operation of the apparatus shown in FIG. 1. Parent device, 2. Wireless telephone, 3. Wired line, 4.
…… Hybrid circuit, 5,17 …… Transmitter, 6,18 …… Transmit antenna, 7,13 …… Receive antenna, 8,14 …… Receiver, 9,
19 …… Synthesizer, 10,20 …… Reception electric field detection circuit, 11,
21 ... Identification signal detection circuit, 12,22 ... Control circuit, 15 ...
Handset, 16 ... Transmitter, 23 ... Speaker, 25 ... Rectifier stabilization circuit, 26 ... Current limiting resistor, 27,28 ... Charging terminal, 2
9 …… Battery, 30 …… Key unit, 31 …… Alarm sound circuit, 3
2 …… Notification circuit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuji Ota 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Ning Hatakeyama 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Japan (72) Inventor Shin Saegusa 5-33-1, Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Yukihiro Shimura 5-33-1, Shiba, Minato-ku, Tokyo NEC Corporation In-house (72) Inventor Shoji Fuse, 3-1, Asahigaoka, Hino-shi, Tokyo 1 Hino Plant, Toshiba Corporation (72) Inventor, Koji Ono 1-3-1, Asahigaoka, Hino City, Tokyo In Hino Plant, Toshiba Corporation (56) References JP-A-60-182228 (JP, A) JP-A-54-75201 (JP, A)

Claims (2)

(57) [Claims] 1. A parent device connected to a wired telephone line, and a wireless telephone connected to the parent device via a wireless line, wherein the parent device is provided with a lowering of the received electric field level of the wireless line. In a radiotelephone device provided with a reception electric field level detecting means for detecting and a means for cutting off a voice received from the radiotelephone in response to a detection output of the reception electric field level detecting means, a detection output of the reception electric field level detecting means A timer means for starting operation in response to the control signal, and outputting a signal that the detection output of the reception electric field level is still generated even after a lapse of a predetermined time; and Means for transmitting a signal tone. 2. The radiotelephone apparatus according to claim 1, further comprising means for transmitting a signal tone to the radiotelephone in response to the output of the timer means.